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Item#: N82E16811129042

Antec Three Hundred Black Steel ATX Mid Tower Computer Case

  • Steel ATX Mid Tower
  • USB 2.0 / Audio Front Ports
  • 3 External 5.25" Drive Bays
  • 6 Internal 3.5" Drive Bays
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Learn more about the Antec Three Hundred


Three Hundred


ATX Mid Tower
Case Material
With Power Supply
Power Supply Mounted
Motherboard Compatibility
Mini-ITX, microATX, Standard ATX
With Side Panel Window


External 5.25" Drive Bays
External 3.5" Drive Bays
Internal 3.5" Drive Bays
Expansion Slots

Front Ports

Front Ports
USB 2.0 / Audio

Cooling System

80mm Fans
120mm Fans
1 x 120mm TriCool rear fan
140mm Fans
1 x 140mm TriCool top fan

Physical Spec

18.30" x 8.10" x 18.00"
15.9 lbs.


CPU cut-out allows for easy installation of CPU coolers
Washable air filters reduces dust build up in your system, which helps keep your system cooler
Perforated front bezel for maximum air intake
Maximum video card size: 11"/279mm (Note: some video cards may block access to the adjacent hard drive bay)
Top mounted I/O ports for easy access

Manufacturer Warranty

3 years limited
3 years limited

Quick Info


  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years

Customer Reviews of the Antec Three Hundred

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  • Gregory W.
  • 7/9/2014 6:43:55 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsFunctionality without the flash

Pros: Simple, clean design without any ostentatious LEDs. Easy to disassemble and clean. Bottom-mounted power supply bracket made installation a breeze when I first got it. Plenty of hardware included for mounting motherboard. Included fans have reasonable volume and easily-adjustable speeds. Space for three more fans makes adding additional cooling simple. Plenty of room for extra cable storage.

Cons: Power button feels a little cheap in comparison to the rest of the case. Case needs to be opened in order to change fan speeds. Black exterior tends to make oils from fingers and dust show up pretty easily, needs to be wiped down pretty often if it gets moved around a lot.

Other Thoughts: I've been using this case for three years and I'm a big fan. I love the simple design and the fact that it's perfectly functional without being too flashy, while still maintaining a sleek elegance that comes from its classy all-black design. My roommate in college used the same case and had a similar view. I would definitely make this my first choice if I was in the market for a new case.

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  • Stephen B.
  • 7/6/2014 1:27:38 PM
  • Tech Level: Somewhat High
  • Ownership: more than 1 year
  • Verified Owner

4 out of 5 eggsSuch a simple problem

Pros: Overall excellent case in almost every way - great design and mostly metal.

Cons: The on/off power/reset switch set is so cheap and breaks so easily. After many e-Mails, the company finally sent me an incorrect replacement part. The correct part is not listed on the Antec parts site. For lack of a 1 cent piece of plastic, I have a magnificent piece of junk. In fairness, I gave up trying to get the correct replacement piece from them.

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  • Richard C.
  • 6/23/2014 12:44:54 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsANTEC 300 MidTower

Pros: Easy to open, Nice design, solid.

Cons: Comes with two speed controlled fans. I really wish they would design the speed control to be mountable.

Other Thoughts: These cases are SOLID, easy to work with and are excellent quality.

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  • Mike S.
  • 6/18/2014 10:25:25 PM
  • Tech Level: Somewhat Low
  • Ownership: less than 1 day
  • Verified Owner

2 out of 5 eggsBe Careful

Pros: Nice case, has a good bit of space

Cons: Power button doesn't work. Reset button works as the power button.

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  • Lacrisha C.
  • 6/18/2014 2:32:25 PM
  • Tech Level: Average
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsPoor Customer Support

Pros: It's easy to build inside.

Cons: The case slowly died and in 6 months, died completely. Having a little above average tech knowledge and this being my first computer to build, I ended up buying 4 different replacement parts before realizing it was the case. The power button wouldn't work. I contact support, and accidentally sent them the wrong invoice, and while I am on the phone about the issue I go get the invoice and the support tells me the case won't be replaced but they will send me the replacement parts. At this, I panicked. I know nothing about replacing parts.
She told me I needed to calm down and I hadn't even lost my cool, which I found to be inappropriate. I understand customers can get upset, but I hadn't, yet. She put me on hold because she lost her cool when I said I was thoroughly disappointed with their company about how they were handling this situation.

The kicker: after sending the correct invoice, I receive an response that says they no longer have parts for this computer so I couldn't get it replaced anyways. Would I like to be put on an email when it comes in? Well yeah, I'd rather not flush $70+ down the drain.

This experience is ridiculous. Spending that much time on the phone having it explained to me that it would be easy to replace the part and they'd walk me through it and I can't have my case simply replaced, all for them to not even have parts for it.

My new replacement case I bought after this frustration works great. It also looks better. Spend the extra money!!!!! Buy a better case!!!!

Other Thoughts: I will be avoiding Antec products from now on. They need a better support staff....and better support in general.

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  • L. A.
  • 6/9/2014 12:19:21 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsA simple case for a "sleeper" build

Pros: This case is an accepted commercial choice. This 300 case (and the 900 and 1200 cases) are what you see in booths at conventions. Everybody likes these basic Antec cases because they're plain and inconspicuous and predictable.

The exterior reveals a modest-looking case with an inconspicuous logo at the bottom of the front panel (see Other Thoughts), no windows to peer through, just a plain ol' black box.

It's what I want: No peek-a-boo that invites a senseless LED light display, several fan mounts for good ventilation, plenty of internal drive bays, and three exterior bays.

In automobiles, a "sleeper" is a plain-looking car that beats all rivals in a road race. This case is an outstanding choice for building a "sleeper" computer. Don't spend lots of money on windows and lights and lots of room under the hood; spend your money on an engine!

Cons: Although Antec makes an excellent fan, they do not make PWM fans. Although the stock fans are top quality and operate dead-silent, I replaced them. If Antec made 4-pin PWM fans, I would definitely bought those. Then again, nobody sells cases with stock PWM fans. I always need to replace those stock fans with PWM fans anyway, so no Eggs deducted.

Other Thoughts: Modder Recipe: Remove the "Antec" logo from your case's front panel. Obtain "JB Plastic Weld" putty at the hardware store. Mask off the "Antec" logo with painters tape to keep your putty job neat. Prepare the putty according to directions and apply it to cover the logo completely. Let it cure, then sand it using 200 grit and a 400 grit wet-sand. Polish with steel wool. Spray-paint it satin black.

1 out of 1 people found this review helpful. Did you? Yes No

  • Frank K.
  • 6/6/2014 10:33:08 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsA modern classic

Pros: There are so many! the case is well built-- solid, thick metal, with nice fit and finish. It has a bottom mount PSU (with no bottom grille-- which I initially thought was a negative, but turned out to be a positive... see "Other thoughts" below).

The case has 2x120 front fan locations that can be removed completely from the case (makes using silicone mounts super easy), has plenty of ventilation (CPU and GPU are 5 degrees cooler in this case than in my previous one at lower fan speed), a washable front panel filter, traditional front to back HDD mounting (while some see this as a negative, I much prefer the better ventilation), front panel USB/power/reset/audio/LED is mounted up high (easier to reach when case is on the floor) and are mounted to the case, so you can remove the front panel without issue without it being tethered to the case by the cords.

All of the fan mounts are well-sized (meaning that none of the fan's swept area is covered) and very well-perforated (less metal, more air space) for max flow and lower noise. It has a nice clean looking interior (I don't like the all black look), lots of thumbscrews included, not to mention enough standoffs for a full ATX board!

Earlier revisions of this case did not have a cutout for the CPU cooler backplate, but this one does.

I don't like buttons (power, reset, etc) that require a piece of plastic to flex. They usually break in time. It looked like this case might have had such a power button, but thankfully, it doesn't. It has a very nice, quality feel, and the reset button is small enough to prevent accidental presses. The power and HDD LED are blue, which I find attractive.

I like that it is not a tool-free design. I know you can use screws with the tool-free cases as well, but if you are going to do that, what is the point of tool-free? I built my first PC in 1990, so I guess I am a little old-school.

I also like that the case has only USB 2.0 support. Sounds weird to some, I imagine, but my motherboard (as usual) only has one 20 pin USB 3.0 header, and I like having an internal card reader that works at USB 3.0 speed and has a built-in hub. My card reader now gives me 4 USB 3.0 ports and reads all of the common flash memory cards, which to me is a better use of the sole USB 3.0 header than the two USB 3.0 ports on more recent cases. If this case had USB 3.0 ports, I would end up using an adapter to connect them to the 2.0 headers. Sometimes less is more!

Cons: If you like toolless drive mounts, this case doesn't have any.

For some, the old school front to back hard drive mounts might be a negative-- it restricts video cards to 11 inches (which is plenty for most of them-- only the ones with 3 fan coolers are a problem) and makes it a little harder to get hard drives in and out, but the side-saddle drive cages are also a restriction to airflow. Besides, the design of this case makes it possible to mount and remove hard drives from the front, through the fan mounts! Just unscrew the two captive thumbscrews and swing the fan and mount out of the way, and the hard drive bays are exposed.

The Tricool 140mm fan in the top of the case is pretty noisy at higher speeds, and while you can reduce the speed with the included 3-speed switch, it makes the top fan less usable with motherboard fan control. With the switch and the motherboard slowing the fan, it simply stops spinning at lower commanded fan speeds. Set it to a higher speed and that is no longer a problem, but then the noise is excessive when it gets warmer inside the case. I'll soon be replacing that fan with something else.

I did not even try the rear Tricool fan (120mm). I already have plenty (too many!) 120mm fans I like on hand, so that one got replaced before first power up.

The front HD audio cord should be a little longer. Most motherboards have the header for this on the lower rear edge of the motherboard, and while it does reach, it requires me to route it across the motherboard rather than behind it or around the edge. Similarly, the USB 2.0 cord is very thick and can't be routed between the motherboard and the motherboard tray. Perhaps that is a sign of quality or nice RFI shielding or something similar, but I've never had any trouble with cases that have thinner, easier to manage cables.

Other Thoughts: When I first unboxed the case, I was a little surprised to find the bottom of the case was completely solid and not perforated under the PSU (I admit, this would have been obvious had I paid more attention before I bought. I'm glad I didn't-- I might not have bought the case). This is only the second bottom PSU case I've worked with, and I had thought that being able to pull in cool outside air from the bottom was THE reason for a bottom PSU. Apparently not!

The directions for the case said that with a PSU that has a fan on the bottom (as mounted in a top PSU case), like any 120mm or larger PSU fan would be, you should flip the PSU over and mount it fan up. I promptly ignored that and mounted it facing down, and it works great that way. There's a good half inch clearance between the case floor and the PSU-- which is MORE space for airflow than under my other bottom PSU case that has the bottom intake. That guy has about 3/8" between the floor and the bottom grille, and it has to be on a hard surface (carpet a definite no-no). And that's with the additional restriction of the bottom grille and the dust filter!

I ran Prime 95 large in place FFT and Furmark burn-in at the same time for at least 20 minutes, and the PSU fan barely even moved, indicating that it was running nice and cool. It's the best of both worlds-- the PSU is down at the bottom, not pulling in the hottest air in the case, which improves the PSU efficiency and service life, and keeps the PSU fan slow and quiet... and it can be used on carpet without any airflow issues, and you never need to worry about the bottom air filter. The front one still needs to be cleaned, but that would be the case even if the PSU did pull air in from below the case.

I considered the Antec One and the Three Hundred Two, but because of the features listed above, I chose the Three Hundred. It's a discontinued item, so if you want one, better grab it now while it's still available.

2 out of 2 people found this review helpful. Did you? Yes No

  • Robert H.
  • 6/3/2014 11:32:25 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsGreat Case!

Pros: This case is a great value! I am running a 2500K in it with no temp issues when overclocking. I am currently using it in a 24/7 system and have had it for over 3 years with no issues!

Cons: None! For the price it is a good case that does exactly what I needed

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  • David B.
  • 4/28/2014 2:17:23 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsQuality at great price.

Pros: Great quality case. Solid. Top fan. Fast shipping.

Cons: Internal wiring could be a little better, but this is splitting hairs.

Other Thoughts: This is the second one of this model I've purchased and I couldn't be more pleased. Nothing fancy, just a great steel case that has excellent ventilation and durability. Highly recommended!

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  • Chris R.
  • 4/24/2014 8:29:30 AM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsPretty impressed

Pros: Great case for the price. Looks good, nice simple clean design. I would recommend it.

Cons: Small complaint - SSD mount on the bottom of the case makes it tricky to connect to power and SATA to the SSD. It's possible, but you'll need a flat SATA cable and you'll need to bend the power wires a bit.

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Item#: N82E16811129042
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